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Special super-plasticizer for manufactured sand concrete and preparation method thereof

A superplasticizer and concrete technology, applied in the field of concrete superplasticizer, can solve the problems of high viscosity of machine-made sand concrete, insufficient initial workability, rapid loss, etc.

Active Publication Date: 2019-09-27
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to effectively solve the problems of high viscosity, insufficient initial workability, and rapid loss of machine-made sand concrete prepared by ordinary superplasticizers, the present invention provides a superplasticizer with a new structure dedicated to machine-made sand concrete and its preparation method and application

Method used

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  • Special super-plasticizer for manufactured sand concrete and preparation method thereof
  • Special super-plasticizer for manufactured sand concrete and preparation method thereof
  • Special super-plasticizer for manufactured sand concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] (1) Add 4.43 parts of dioxane to the reactor under anhydrous conditions, add 3.658 parts of B1 to it, stir and dissolve, adjust the reactor to 80°C, and at the same time add 0.942 parts of C1 continuously and uniformly within 6 hours, After adding, continue to stir and react for 6h to obtain the intermediate solution;

[0087] (2) Add 1.884 parts of dioxane and 1.884 parts of E1 to another anhydrous reactor, stir to dissolve, adjust the reactor to 80°C, add 0.00540 parts of sodium methoxide, and continuously and uniformly add step (1) The intermediate solution prepared, after adding and continuing to stir and react for 6 hours, a new intermediate solution is obtained;

[0088] (3) Add 3.484 parts of dioxane and 3.484 parts of B1 to the third anhydrous reactor, stir to dissolve, adjust the reactor to 80°C, add 0.00540 parts of sodium methoxide, and continuously and uniformly add it within 6 hours The intermediate solution prepared in step (2), after the addition is comp...

Embodiment 2

[0094] (1) Add 19.88 parts of dimethyl sulfoxide to the reactor under anhydrous conditions, add 5.206 parts of B2 to it, stir and dissolve, adjust the reactor to 150°C, add 0.144 parts of sodium tert-butoxide to it, and within 1h A solution of 1.422 parts of C2 dissolved in 1.422 parts of dimethyl sulfoxide is continuously and uniformly added, and the stirring reaction is continued for 1 hour after adding to obtain an intermediate solution;

[0095] (2) Add 15.024 parts of dimethyl sulfoxide and 5.258 parts of E2 to another anhydrous reactor, stir to dissolve, adjust the reactor to 150°C, add 0.1922 parts of sodium tert-butoxide, and continuously and uniformly Add the intermediate solution prepared in step (1), and after adding, continue to stir and react for 3 hours to obtain a new intermediate solution;

[0096] (3) Add 120 parts of dimethyl sulfoxide and 40 parts of B5 to the third anhydrous reactor, stir to dissolve, adjust the reactor to 150°C, add 0.3844 parts of sodium ...

Embodiment 3

[0102] (1) Add 13.68 parts of N,N-dimethylformamide to the reactor under anhydrous conditions, add 6.068 parts of B3 to it, stir to dissolve, adjust the reactor to 100°C, and add 0.0449 parts of tert-butyl to it Potassium alkoxide, while continuously and uniformly adding 0.772 parts of C3 to it within 2 hours, after adding, continue to react for 4 hours to obtain an intermediate solution;

[0103] (2) Add 4.628 parts of N,N-dimethylformamide and 2.314 parts of E3 to another anhydrous reactor, stir to dissolve, adjust the reactor to 120°C, add 0.0337 parts of potassium tert-butoxide, and Continuously and uniformly add the intermediate solution prepared in step (1) to it, and obtain a new intermediate solution after adding and continuing to react for 6 hours;

[0104] (3) Add 31.24 parts of N,N-dimethylformamide and 15.62 parts of B2 to the third anhydrous reactor, stir to dissolve, adjust the reactor to 120°C, add 0.0674 parts of potassium tert-butoxide, and at the same time A...

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Abstract

The invention discloses a special super-plasticizer for manufactured sand concrete and a preparation method thereof. The super-plasticizer of the invention has a structure formed after a terminal adsorption functional group, which is formed by an addition reaction between a functional small molecule and an epoxy functional group, and a linking or branching functional group thereof are grafted to a main polymer chain, wherein the chain structure is mainly composed of an ethyoxyl unit and the linking or branching functional group; and the linking or branching functional group may occur in the middle of a chain bifurcation node or any one section of linear branch of a polymer. In comparison with a commercially available ordinary superplasticizer, the superplasticizer of the invention has the following advantages when being applied to manufactured sand mortar with high water-binder ratio or commercial concrete: dispersibility is improved, fluidity maintaining ability and stability are enhanced, and working performance is improved; and when the superplasticizer of the invention is applied to manufactured sand high-strength concrete of C50 and above, the use amount can be obviously reduced with the same fluidity, workability is significantly improved under the same fluidity condition, the emptying time of an inverted slump cone is shortened, and viscosity is reduced.

Description

technical field [0001] The invention relates to the field of concrete superplasticizers, in particular to a special superplasticizer for machine-made sand concrete and a preparation method thereof. Background technique [0002] The term "concrete" is used here generally indiscriminately to mean concrete such as concrete, mortar or grout, and this applies elsewhere in this document as well. [0003] Since the invention of high-performance water reducer (polycarboxylate water reducer), it has been widely used and developed greatly, and it has become an indispensable component in concrete. Generally, the polycarboxylate superplasticizer is a comb-shaped structure, which is generally prepared by free radical polymerization of vinyl monomers, and its main chain (generally -CH 2 -CH 2 -Structure or functional group substituted -CH 1 -CH 2 - structure) is connected with charged functional groups (such as carboxyl, sulfonic acid groups, etc.), and the corresponding side chains a...

Claims

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Application Information

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IPC IPC(8): C08G83/00C04B24/16C04B24/28C04B103/32
CPCC08G83/005C04B24/166C04B24/243C04B24/28C04B2103/32
Inventor 舒鑫杨勇冉千平毛永琳张倩倩王秀梅周栋梁严涵
Owner JIANGSU SOBUTE NEW MATERIALS
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